Bill, Jon, you surprise me.
"Out and Back" by my definition is almost solely as a function of the site, primarily due to the way links land forms.
TOC, Dornoch, Deal, North Berwick, Dunbar, Nairn, Royal Dublin, Troon are all examples, most with a few kinks but all restrained to parallel holes because of the site.
Can't think of any inland courses off the top of my head.
Merely having the 9th green removed from the clubhouse (e.g. the majority of British courses) is an example of a course with non-returning nines, a much larger all encompassing routing category.
Be interested in what others think. Regardless, it won't change my definition.